FRENCH TOWNSHIP, Minn. (AP) — A Minnesota neighborhood campfire meant to celebrate the holiday weekend became deadly after an unknown flammable liquid induced exploding flames, killing one man and burning and injuring others.

A 53-year-old man died Friday evening as a result of his injuries and a child who sustained serious burns was airlifted to a hospital in Minnesota’s Twin Cities, according to county officials.

In total, eight children and adults suffered burns and inhalation injuries from the campfire in French Township, a small lakeside community.

The St. Louis County sheriff’s office said the flammable liquid used to start the fire was not known. An investigation is underway.